Financial processes in the Purchase Orders application
The Material Orders from External Vendor action that is selected from the PO Lines tab in the Purchase Orders application, causes GL account transactions to be written.
You can copy purchase order line items from purchase requisitions line items or you can enter them directly on a purchase order. In the first case, the general ledger fields are copied from the purchase requisition. In the second case, purchase order line general ledger fields default exactly as they do on a purchase requisition.